LE6XRT ERV
25
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
ELECTRICAL CONNECTIONS
7.3 EXTERNAL CONTROL CONNECTIONS
7.3.1 Single 2 - Wire Control, Unpowered
7.2.2 Units With Variable Frequency Drives (VFDs)
Dry Contactors and Overload Relays
Single 2-Wire Control, Unpowered
Dry
Contactors
Relay Manual
Reset Button
Overload Relays
Overload
Adjusting Screws
In units equipped with a VFD(s), motor overload protection is provided by the VFD. See separate
documentation supplements.
NOTE: Some units are equipped with only one VFD, which controls a single motor. The second motor
(without a VFD) is then protected by an overload relay as described before.
External control wiring is to be terminated on the low voltage terminal strip in the E-Box as shown in
Section 6.4.1 of this manual.
Use the schematic below if the control requires no power from the ERV and acts as a simple ON / OFF
switch. The control must not supply any power to the ERV.
• Install jumper (provided) between terminals 2 and 3.
• Connect the control’s contacts to terminals 1 and 4 to operate the isolation relays for OA / FA
blower.
• Install jumper between terminals 4 and 5 to operate the ERV’s isolation relays for the RA / EA
blower.
